9.5 MCGB-614 Westerbeke 9.5 kW Multiport EFI – 60 Hz – 1800 RPM

Description

New Westerbeke 9.5 MCGB-614 9.5 kW Multiport EFI Marine Generator For Sale

Low-Speed Gasoline Power for Yachts and Marine Vessels

The Westerbeke 9.5 MCGB-614 9.5 kW Multiport EFI Marine Generator is a compact, electronically governed generator designed to provide dependable onboard electricity for gasoline-powered motor yachts, sport cruisers, houseboats, passenger craft, and other compatible marine vessels.

Delivering 9.5 kW at 120/240V, 60 Hz and 1800 RPM, the 9.5 MCGB-614 9.5 combines a smooth four-cylinder industrial engine with sequential multiport electronic fuel injection, a water-cooled returnless fuel system, freshwater cooling, a brushless four-pole alternator, remote starting, automatic safety shutdowns, and Low-CO marine technology.

The standard single-phase configuration produces approximately 79.1 amps at 120V or 39.5 amps at 240V. Westerbeke currently maintains an active product page for the 9.5 MCGB-614 9.5 and published an updated advanced specification sheet in February 2026.

Its output may support compatible onboard systems such as:

• Marine air-conditioning systems
• Refrigerators and freezers
• Battery chargers and inverter-chargers
• Freshwater and seawater pumps
• Water makers
• Navigation and communication electronics
• Cabin and deck lighting
• Electrical outlets
• Entertainment systems
• Galley appliances
• Other compatible hotel and auxiliary loads

Actual suitability depends on the vessel’s continuous electrical demand, compressor and motor-starting current, simultaneous appliance use, distribution voltage, and required generator reserve.

A Gasoline Marine Generator, Not a Diesel Generator

The Westerbeke 9.5 MCGB-614 9.5 is a gasoline or petrol marine generator. It is not designed to operate on diesel fuel.

Its sequential Multiport EFI system electronically controls gasoline delivery to the engine, while the water-cooled returnless fuel system helps reduce the risk of vapor lock in hot machinery spaces. The generator should only be installed aboard a vessel with a properly engineered marine gasoline fuel system, ignition-protected components, suitable ventilation, carbon-monoxide detectors, and a compliant wet-exhaust arrangement.

Correct fuel identification is essential when planning:

• Fuel-tank compatibility
• Fuel-hose specifications
• Fuel filtration
• Machinery-space ventilation
• Ignition-protected electrical components
• Fire and explosion protection
• Exhaust routing
• Carbon-monoxide detection
• Marine installation compliance

Gasoline-generator installation and servicing should be carried out by qualified marine technicians familiar with Westerbeke EFI systems and applicable marine safety requirements.

Low-CO, Low-Profile and Low-Speed Engineering

Westerbeke describes the 9.5 MCGB-614 9.5 as one of its most compact Low-CO, low-speed gasoline generators.

Its 1800 RPM operating speed is half the speed of a typical two-pole 3600 RPM generator. Combined with a heavy-duty four-cylinder industrial engine and compact marine construction, this helps provide smoother operation, reduced mechanical frequency, and dependable long-term performance.

The current base generator measures approximately 31.5 inches long, 18.5 inches wide and 18.1 inches high, with a published dry weight of 445 pounds.

Important features include:

• Sequential Multiport EFI
• Water-cooled returnless fuel system
• Electronic engine governing
• Low-CO exhaust technology
• Freshwater cooling with heat exchanger
• Freshwater-cooled exhaust manifold
• Water-injected marine exhaust
• Brushless four-pole alternator
• Remote start-and-stop capability
• Automatic safety shutdowns
• AC output circuit breaker
• Vibration isolators
• Remote lubricating-oil filter
• Oil-drain hose
• Optional ventilated enclosure

These characteristics make the generator suitable for new installations and compatible marine generator replacement projects.

Smooth Four-Cylinder Gasoline Engine

The Westerbeke 9.5 MCGB-614 9.5 uses a naturally aspirated, four-cylinder, four-stroke gasoline engine with 64.1 cubic inches or approximately 1.051 litres of displacement.

At its rated 1800 RPM operating speed, the engine develops approximately 16.8 horsepower. Its construction includes an aluminium cylinder head, cast-iron cylinder block, forged crankshaft supported by four main bearings, and overhead rotating valves.

Engine specification	Published value
Number of cylinders	4
Cylinder arrangement	Vertical inline
Engine cycle	Four stroke
Fuel type	Gasoline/petrol
Aspiration	Naturally aspirated
Displacement	64.1 cu. in. / 1.051 L
Bore × stroke	2.58 × 3.07 in.
Compression ratio	9.0:1
Engine output	Approximately 16.8 hp
Rated speed	1800 RPM
Combustion system	Semi-spherical
Fuel system	Sequential Multiport EFI
Governor	Electronic
Electrical system	12V DC, negative ground

The four-cylinder layout provides smoother power delivery than many compact twin- or three-cylinder generator platforms. Combined with electronic governing and low-speed operation, it helps minimise vibration and noticeable speed changes when electrical loads are connected.

9.5 kW Electrical Output at 60 Hz

The Westerbeke 9.5 MCGB-614 9.5 provides the following published electrical ratings:

Electrical specification	Rating
Generator model	9.5 MCGB-614
Rated electrical output	9.5 kW
Voltage	120/240V
Rated current	79.1/39.5 amps
Frequency	60 Hz
Phase	Single phase
Number of wires	Four
Power factor	1.0
Operating speed	1800 RPM
Starting arrangement	Remote

The generator uses a four-wire single-phase arrangement and is suitable for compatible North American and other 60 Hz marine electrical systems. The vessel’s neutral configuration, grounding, circuit protection, transfer switch, and connected appliances must be reviewed before installation.

Marine Electrical Load Planning

A professional marine electrical load calculation should be completed before purchasing the 9.5 MCGB.

The assessment should include:

• Continuous electrical demand
• Air-conditioning compressor startup
• Refrigeration compressor startup
• Freshwater-pump starting current
• Seawater-pump starting current
• Battery-charger consumption
• Water-maker demand
• Galley-appliance loads
• Simultaneous equipment use
• Planned future additions
• Desired generator reserve

Electric motors and compressors may require considerably more current during startup than during normal operation. Westerbeke’s operator documentation provides motor-starting examples showing that startup demand can be several times the running current.

Possible signs of an overloaded or undersized generator include:

• Voltage reduction
• Frequency instability
• Difficulty starting compressors
• Engine bogging
• Unstable lighting
• Circuit-breaker operation
• Excessive operating temperature
• Automatic shutdowns

Electronic governing improves transient-load response but cannot compensate for continuous overloading.

Field-Convertible 50 and 60 Hz Platform

The 9.5 MCGB-614 9.5 shares its engine and generator platform with the 7.6 MCGB-514 50 Hz model.

Configuration	Output	Voltage	Frequency	Speed
9.5 MCGB-614	9.5 kW	120/240V	60 Hz	1800 RPM
7.6 MCGB-514	7.6 kW	230V	50 Hz	1500 RPM

Westerbeke describes the platform as field-convertible between 50 and 60 Hz. Conversion affects engine speed, rated output, voltage connections, electronic settings, circuit protection, identification labels, and compatibility with connected appliances.

Any conversion should be completed by an authorised or suitably qualified Westerbeke technician using the approved technical procedure. 9.5 MCGB-614 9.5

Sequential Multiport Electronic Fuel Injection

The 9.5 MCGB-614 9.5 uses sequential multiport electronic fuel injection, commonly referred to as Multiport EFI or MPI.

Instead of relying on a conventional carburettor, the system electronically controls fuel delivery to the engine’s intake ports. Westerbeke identifies the benefits of MPI as improved fuel efficiency, easy starting, increased reliability, reduced emissions, and advanced diagnostic capability.

Potential operational benefits include:

• Easier cold and warm starting
• Precise fuel delivery
• Consistent air-to-fuel control
• Improved response to changing loads
• Reduced fuel-related hesitation
• Improved high-temperature operation
• Electronic fault diagnosis
• Reduced normal exhaust emissions

The EFI system works with the electronic governor to help prevent the engine from bogging down when substantial electrical loads are applied.

EC-11 Electronic Diagnostics

Westerbeke provides EC-11 diagnostic software for qualified technicians working on compatible Multiport EFI generators.

The software can provide detailed operating parameters and help diagnose:

• EFI sensor faults
• Fuel-delivery problems
• Electronic-governor issues
• Difficult starting
• Unstable engine speed
• Ignition-system faults
• Unexpected shutdowns
• Abnormal load response

Westerbeke states that its proprietary diagnostic software should be used by qualified technicians and requires the appropriate Westerbeke interface cable.

Electronic diagnostics do not replace mechanical inspection, fuel-pressure testing, cooling-system checks, exhaust inspection, or scheduled maintenance.

Water-Cooled Returnless Fuel System

Gasoline may vaporise when exposed to high machinery-space temperatures. This can cause vapor lock, difficult starting, unstable operation, or interrupted fuel delivery.

The 9.5 MCGB-614 9.5 uses a water-cooled returnless fuel system designed to help control fuel temperature and improve performance in demanding ambient conditions.

A correctly installed marine gasoline fuel system should include:

• Approved gasoline-resistant marine hose
• Correctly sized fuel-supply piping
• Accessible fuel shutoff valve
• Suitable fuel filtration
• Secure and leak-free connections
• Proper grounding and bonding
• Ignition-protected electrical components
• Adequate machinery-space ventilation
• Regular fuel-leak inspections

The published fuel-supply connection is approximately ¼-inch internal diameter or 6.35 mm.

Westerbeke Low-CO Technology

The Westerbeke 9.5 MCGB-614 9.5 is marketed as a Low-CO marine gasoline generator.

Low-CO does not mean zero carbon monoxide. Carbon monoxide remains colourless, odourless, poisonous, and potentially fatal.

Every gasoline-generator installation should include:

• Approved marine carbon-monoxide detectors
• Correct detector placement
• Adequate machinery-space ventilation
• A properly installed and leak-free exhaust
• Correct exhaust-outlet positioning
• Regular catalyst and exhaust inspection
• Proper fuel- and ignition-system maintenance
• Professional CO testing where required

Westerbeke’s current operator manual instructs that carbon-monoxide detectors be installed in the vessel’s living and sleeping quarters and warns that exhaust exposure can cause unconsciousness or death.

Catalyst and Exhaust-System Maintenance

The exhaust after-treatment system is important to the generator’s Low-CO performance.

Its effectiveness may be affected by:

• Seawater intrusion
• Incorrect air-to-fuel mixture
• Ignition-system faults
• Electronic-control faults
• Exhaust overheating
• Catalyst deterioration
• Exhaust leaks

The generator should not be operated with:

• A damaged catalyst
• A leaking exhaust connection
• A corroded water-injection elbow
• A malfunctioning EFI component
• An inoperative carbon-monoxide detector
• Evidence of seawater entering the engine or exhaust

The catalyst, exhaust elbow, muffler, exhaust hose, clamps, siphon break, and discharge outlet should be inspected according to the applicable Westerbeke maintenance schedule.

Electronic Governing for Stable Frequency

The 9.5 MCGB-614 9.5 uses an electronic engine governor to maintain its rated 1800 RPM speed as connected electrical demand changes.

When an air-conditioning compressor, pump, charger, or other substantial load starts, the engine experiences an immediate increase in mechanical demand. The governor adjusts engine operation to reduce speed loss and maintain stable 60 Hz output.

Westerbeke publishes frequency regulation of approximately 0.5 Hz, or 1%, from no load to full load.

Stable frequency supports compatible:

• Air-conditioning systems
• Refrigeration compressors
• Battery chargers
• Electric pumps
• Navigation electronics
• Communication systems
• Lighting circuits
• Entertainment equipment
• Monitoring systems

Brushless Four-Pole Alternator

The Westerbeke 9.5 MCGB-614 9.5 uses a brushless four-pole revolving-field alternator.

Its published alternator features include:

• Brushless construction
• Four-pole design
• Revolving electrical field
• Class H winding insulation
• Direct-connected centrifugal cooling blower
• Approximately ±5% voltage regulation
• Approximately 0.5 Hz frequency regulation
• Temperature rise within the applicable NEMA definition

The four-pole design allows the generator to produce 60 Hz electricity at 1800 RPM. Brushless construction reduces servicing associated with carbon brushes, while Class H insulation provides thermal protection for the windings.

Reliable electrical performance still depends on correct:

• AC cable sizing
• Circuit protection
• Grounding and bonding
• Neutral configuration
• Shore-power transfer switching
• Cable separation
• Ventilation
• Load management

Freshwater Cooling with Marine Heat Exchanger

The 9.5 MCGB-614 9.5 uses a freshwater cooling system with a marine heat exchanger.

Internal coolant circulates through the engine and freshwater-cooled cast-aluminium exhaust manifold. Raw water drawn through the vessel’s seawater intake removes heat through the exchanger before being discharged through the water-injected exhaust system.

The cooling arrangement includes:

• Closed freshwater coolant circuit
• Marine heat exchanger
• Coolant-recovery tank
• Freshwater-cooled exhaust manifold
• Belt-driven raw-water pump
• Water-injected exhaust elbow
• ¾-inch raw-water connection

The published cooling-system capacity is approximately 4.75 US quarts or 4.5 litres.

Routine maintenance should include inspection of:

• Coolant level and condition
• Raw-water seacock
• Seawater strainer
• Raw-water pump and impeller
• Pump drive belt
• Heat-exchanger passages
• Cooling hoses and clamps
• Exhaust-injection elbow
• Siphon break
• Wet-exhaust hose
• Waterlift muffler

Restricted raw-water flow may cause high coolant or exhaust temperature and activate the protective shutdown system.

Approximate Fuel Consumption

Westerbeke publishes the following approximate gasoline-consumption figures for the 9.5 MCGB at 1800 RPM:

Generator load	Approximate consumption
100% load	1.24 US gal/hr / 4.68 L/hr
75% load	1.02 US gal/hr / 3.85 L/hr
50% load	0.79 US gal/hr / 3.00 L/hr
25% load	0.59 US gal/hr / 2.25 L/hr

Actual fuel consumption will vary according to connected demand, engine condition, fuel quality, ambient temperature, ventilation, installation, and maintenance.

One-Touch Control and Remote Starting

The generator includes a simple one-touch start-and-stop control panel with a running-hour meter and warning-annunciation light strip.

The control and protection arrangement includes:

• Local start-and-stop control
• Running-hour meter
• Warning-annunciation lights
• Electronic engine control
• Automatic safety shutdowns
• AC output circuit breaker
• Optional remote start-and-stop panel
• Optional extension harness

Westerbeke’s operator manual explains that the same three-position start-and-stop rocker switch is used on both the generator-mounted and optional remote control panels.

Automatic Safety Warnings and Shutdowns

Published protection includes monitoring and shutdown for:

• Engine overspeed
• Engine underspeed
• Low lubricating-oil pressure
• High exhaust temperature
• High engine-coolant temperature
• Additional monitored faults

These protections help reduce the risk of serious damage but do not replace routine checks of oil, coolant, raw-water flow, fuel connections, exhaust components, ventilation, and electrical wiring.

Starting System and Battery Charging

The 9.5 MCGB-614 9.5 uses a 12V, 1.4 kW electric starting motor and has a published minimum cranking requirement of approximately 120 amps at 70°F.

Westerbeke’s current product overview lists a 10-amp battery charger, while its February 2026 advanced specification sheet lists a 12-amp integral charger. The exact charging rating should therefore be confirmed for the generator’s serial number and production specification before quotation or installation.

Optional Westerbeke Ventilated Enclosure

The 9.5 MCGB can be supplied with an optional Westerbeke ventilated enclosure, commonly referred to as the Venclosure.

Enclosure measurement	Specification
Length	34.0 in. / 863 mm
Width	22.6 in. / 573 mm
Height	19.5 in. / 494 mm
Approximate weight	30 lb. / 14 kg

Westerbeke specifies that the enclosure is not sold separately, so it should normally be selected with the generator order.

The enclosure provides a finished protective installation while maintaining generator airflow. It does not replace correctly engineered machinery-space ventilation or ignition-protected blower arrangements.

Dimensions and Installation Planning

Measurement	Published specification
Length	31.50 in. / approximately 800 mm
Width	18.50 in. / approximately 470 mm
Height	18.10 in. / approximately 460 mm
Dry weight	445 lb. / 201.9 kg
Raw-water connection	¾ in. / 19.1 mm
Exhaust connection	2 in. / 50.8 mm
Fuel-supply connection	¼ in. ID / 6.35 mm
Lubricating-oil capacity	4.1 US qt / 3.9 L
Cooling-system capacity	4.75 US qt / 4.5 L
Maximum operating angle	25° in all directions

Westerbeke states that the general drawing is for reference and should not replace the approved model-specific installation drawing.

Before installation, confirm:

• Machinery-space dimensions
• Mounting-hole positions
• Lifting and removal route
• Routine service access
• Fuel-system compatibility
• Ignition-protected ventilation
• Raw-water intake arrangement
• Anti-siphon requirements
• Wet-exhaust routing
• Starting-battery cable size
• AC output cable size
• Grounding and bonding
• Shore-power transfer switching
• Carbon-monoxide detector placement
• Optional enclosure clearance

Complete Technical Specifications

Specification	Details
Manufacturer	Westerbeke
Model	9.5 MCGB-614
Generator type	Multiport EFI Marine Gasoline Generator
Rated output	9.5 kW
Voltage	120/240V
Frequency	60 Hz
Phase	Single phase
Rated current	79.1/39.5 amps
Number of wires	Four
Power factor	1.0
Operating speed	1800 RPM
Engine cylinders	Four
Engine configuration	Vertical inline
Engine cycle	Four stroke
Aspiration	Naturally aspirated
Displacement	64.1 cu. in. / 1.051 L
Bore × stroke	2.58 × 3.07 in.
Compression ratio	9.0:1
Engine output	Approximately 16.8 hp
Fuel system	Sequential Multiport EFI
Fuel cooling	Water-cooled returnless system
Governor	Electronic
Alternator	Brushless, four pole
Voltage regulation	Approximately ±5%
Frequency regulation	Approximately 0.5 Hz
Winding insulation	Class H
Cooling system	Freshwater with heat exchanger
Exhaust manifold	Cast aluminium, freshwater cooled
Raw-water pump	Belt driven
Starting system	12V, 1.4 kW electric
Raw-water connection	¾ inch
Exhaust connection	2 inches
Dimensions	31.5 × 18.5 × 18.1 in.
Dry weight	445 lb. / 201.9 kg
Maximum operating angle	25° in all directions
Optional enclosure	Westerbeke Venclosure
Diagnostic system	Westerbeke EC-11 compatible

Standard Equipment

Typical standard features include:

• Four-cylinder gasoline engine
• Sequential Multiport EFI
• Water-cooled returnless fuel system
• Electronic engine governor
• Low-CO marine system
• One-touch start-and-stop panel
• Running-hour meter
• Warning-annunciation lights
• Automatic safety shutdowns
• Freshwater cooling
• Coolant-recovery tank
• AC circuit breaker
• Integral starting-battery charger
• Water-injected exhaust elbow
• Belt-driven raw-water pump
• Vibration isolators
• Remote lubricating-oil filter
• Oil-drain hose
• Belt guard
• Operator’s manual
• Parts documentation

Westerbeke states that the 9.5 MCGB-614 9.5 meets applicable US Coast Guard, CARB, US EPA and CE requirements and is backed by a five-year limited warranty, subject to the manufacturer’s registration, installation, application, commissioning and warranty conditions.

Optional Equipment

Available options include:

• Remote start-and-stop panel
• Extension wiring harness
• Ventilated enclosure
• SIDEX water-injected exhaust elbow
• Hydro-Hush muffler and fittings
• Anti-siphon valve with stainless-steel loop
• Ship-to-shore transfer switch
• Auxiliary DC power adapter
• Onboard spare-parts kit
• Extended-cruising spare-parts kit

Accessory availability and final package contents should be confirmed during quotation.

Frequently Asked Questions

Is the Westerbeke 9.5 MCGB-614 9.5 a diesel generator?

No. It is a gasoline or petrol marine generator equipped with sequential Multiport EFI.

How much power does the 9.5 MCGB-614 produce?

It produces 9.5 kW at 120/240V, 60 Hz and 1800 RPM, with a rated current of 79.1/39.5 amps.

Is the generator single phase?

Yes. The 9.5 MCGB-614 9.5 is a four-wire, 120/240V, single-phase generator.

How many cylinders does the engine have?

It uses a naturally aspirated four-cylinder gasoline engine with approximately 1.051 litres of displacement.

Does it use electronic fuel injection?

Yes. Sequential Multiport EFI provides electronically controlled fuel delivery, easy starting, improved reliability, reduced emissions, and diagnostic capability.

Is it electronically governed?

Yes. Electronic governing helps maintain 1800 RPM and stable 60 Hz output as connected demand changes.

Is the engine freshwater cooled?

Yes. It uses freshwater cooling with a marine heat exchanger and freshwater-cooled exhaust manifold.

Is the 9.5 MCGB-614 9.5 Low-CO?

Yes. Westerbeke markets the model as a Low-CO gasoline generator. Low-CO reduces normal emissions but does not eliminate carbon monoxide.

Is a carbon-monoxide detector required?

Functioning marine CO detectors should be installed in the vessel’s living and sleeping areas.

Is a ventilated enclosure available?

Yes. An optional Westerbeke Venclosure is available, but Westerbeke states that it is not sold separately.

What is the Westerbeke 9.5 MCGB price?

The Westerbeke 9.5 MCGB-614 9.5 price depends on current availability, optional enclosure, remote controls, exhaust components, installation accessories, shipping destination, and export requirements.

Request a Quote for the Westerbeke 9.5 MCGB-614

The New Westerbeke 9.5 MCGB-614 9.5 kW Multiport EFI Marine Generator combines compact dimensions, low-speed 1800 RPM operation, smooth four-cylinder performance, sequential electronic fuel injection, electronic governing, a water-cooled returnless fuel system, freshwater cooling, a brushless four-pole alternator, remote operation, and Low-CO marine technology.

It is a dependable choice for compatible gasoline-powered yachts and marine vessels requiring 120/240V, 60 Hz auxiliary electricity.

Contact our marine generator specialists to request the latest Westerbeke 9.5 MCGB-614 price, confirm availability, select the correct accessories, and review compatibility with your vessel’s fuel, electrical, ventilation, cooling, and exhaust systems.